1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Manual, P/N 507870, Page 62Get this manual
In-line Fuel FilterCommercial Models f51 1Unscrew in-line filter cover It is not necessary to unclamp fuel hoses to service filter f51 2Clean filter cannister collected particles
and shake filter element to remove
f51 Clean all parts of the filter assembly and fuel connectors in solvent and blow dryDO NOT dry parts with cloth as lint may stick to the parts and clog the passages or prevent the fuel pump valves from seatingDissolve any gummy deposits with OMC Engine Cleaner (certain solvents will not dissolve these deposits)4 In-line fuel filter is serviced as complete assembly onlyReplace the filter once year